Harwich leans Democratic by roughly 22 points: about 61% of voters vote Democratic and 39% Republican.
About 89% of adults in Harwich typically vote, above the U.S. average of about 62%. Among adults in Harwich, ~54% vote Democratic, ~35% Republican, and ~11% don't vote. The map below shows estimated turnout by block group.
How Harwich compares
Among cities within 25 miles, Harwich leans more Democratic than 26 of 41 neighbors.
Politically, Harwich sits close to the rest of Massachusetts.
Politics vary noticeably by neighborhood within Harwich. The east side is the most Democratic-leaning (D+28) and the north side is the least Democratic-leaning (D+15), a spread of about 14 points.
Why Harwich leans the way it does
This analysis examined 14,881 data points per city to find what predicts political lean and turnout. The items below are a few correlations that stood out for Harwich, not a ranked or complete list of what matters most.
Areas with high college attainment vote Democratic. About 52% of adults in Harwich hold a bachelor's degree, about 23 points above the U.S. average of 28%. Dense areas vote Democratic, and Harwich sits in the top fifth on density (about 65%, above 91% of cities).
Preventive-care access and voter turnout
Places with strong routine preventive-care access tend to turn out at a higher rate; Harwich, MA sits in the top tenth nationally on this measure. Dental visits do not drive turnout; the rate reflects income, insurance, and healthcare access, which line up with who votes.
Why turnout in Harwich looks the way it does
Areas with strong routine healthcare access turn out at higher rates. Harwich is in the top quarter nationally for routine-care measures such as insurance coverage, preventive screenings, and dental visits. The dental-visit rate here is about 76%, about 16 points above the U.S. average of 60%. High high-school completion lines up with higher turnout, and about 98% of adults in Harwich have completed high school, above 94% of cities. Learn more about the findings and methodology on the political spectrum map.
Nearby Cities
- Harwich Port, MA D+21
- Northwest Harwich, MA D+17
- East Harwich, MA D+16
- South Chatham, MA D+33
- Dennis Port, MA D+17
- Brewster, MA D+29
- West Chatham, MA D+31
- South Dennis, MA D+16
- Chatham, MA D+31
- North Chatham, MA D+27
Cities with Similar Populations
- Clayton, NY R+12
- Black Hawk, CO D+15
- Plympton, MA R+14
- Berlin, MA D+18
- Catawissa, MO R+51
- San Manuel, AZ R+26
- Omega, GA R+59
- Grundy Center, IA R+43
- Buffalo, TX R+65
- Heiskell, TN R+62
Sources and methodology
Precinct-level voting records used to fit the model come from Massachusetts Secretary of the Commonwealth, Elections, distributed by the Voting and Election Science Team. Demographic inputs come from the U.S. Census Bureau (ACS 5-year estimates and the 2020 Decennial Census). Health and environmental inputs come from the CDC (PLACES and the Environmental Justice Index). Land cover comes from the USGS and EPA. Election-day and lead-up weather come from PRISM 4km daily grids and the NOAA Global Historical Climatology Network. Mail-voting and election-administration patterns come from the MIT Election Lab's Survey of the Performance of American Elections. Block-group crime detail comes from CrimeGrade. Internet data and modeling support provided by ISPreports.org.
Modeling and analysis by the BestNeighborhood data science team. Full methodology and findings: political spectrum map.
Methodology reviewed by the BestNeighborhood data team. Last updated May 2026.